4 layers304.5 × 217.2 mm
Latest Full Backplane
Trilobyte-CPU/8-bit-computer
A DIY 8-bit computer built mostly with discrete logic chips
478 parts2
4 layers147.5 × 134 mm
8-bit computer
Davoskio/8-bit-computerbased off Ben Eater's 8-bit-computer videos
- Size
- 147.5 × 134 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 261
- Nets
- 328
- Pads
- 1,211
- Tracks, vias
- 4,051, 871
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 29 Dec 2023
- Updated
- 25 Nov 2024
Overview
8-bit computer is an open-source printed circuit board by Davoskio, from the Davoskio/8-bit-computer repository on GitHub. It is a 4-layer board of 147.5 × 134 mm with 261 parts on 328 nets, routed with 4,051 tracks and 871 vias.
It is built around the 74HC245D, 74LS377PC and NA555D, with the 74HC00D, AT28C64B-15SU-T and 74HC86D among its other parts. Its parts include 97 resistors, 66 diodes, 46 ICs, 42 capacitors and 8 switches. It belongs with the retro computing and games boards of this library.
Main components
12
74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74LS377PC
PDIP-200℃~+70℃ 1 10ns 25ns@5V,15pF 28mA 30MHz 4.75V~5.25V 400uA 5ns 74LS Series 8 8mA D-Type Rising Edge Synchronous PDIP-20 Flip Flops ROHSTexas InstrumentsFlip Flops
NA555D
SOIC-8-40℃~+105℃ 1 200mA 2mA 4.5V~16V Adjustable duty cycle oscillation、Reset function SOIC-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
74HC00D
SOP-14-40℃~+125℃ 1.5V、3.15V、4.2V 1.9V、3.7V、5.9V 100mV、400mV、400mV 2 2V~6V 4 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series 7ns@6V,50pF NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
AT28C64B-15SU-T
SOIC-28-40℃~+85℃ 10ms 4.5V~5.5V 64Kbit Parallel Port (Parallel) SOIC-28-300mil EEPROM ROHSMicrochip TechnologyEEPROM74HC86D
SO-14-40℃~+125℃ 1.5V~4.2V 20ns@6V,50pF 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series XOR Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates74LS02PC
DIP-140℃~+70℃ 15ns@5V,15pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA 8mA NOR Gate DIP-14 Logic Gates ROHSonsemiLogic Gates
74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders
AMS1117-5.0
SOT-223-40℃~+125℃ 1 1.3V 15V 1A 5V 60dB Fixed Positive Short Circuit Protection、Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.md8-bit-computer
Parts
261| Qty | Value | Footprint | References |
|---|---|---|---|
| 64 | 220 Ohms | Resistor_SMD:R_0402_1005Metric | R13, R27, R100, R101, R102, R103, R104, R105, R106, R107, R108, R109, R110, R111, R112, R113 +48 |
| 44 | R_LED | LED_SMD:LED_0805_2012Metric | D3, D24, D25, D26, D27, D28, D29, D30, D31, D32, D33, D34, D35, D36, D37, D38 +28 |
| 35 | 0.1 miF | Capacitor_SMD:C_0402_1005Metric | C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26 +19 |
| 10 | G_LED | LED_SMD:LED_0805_2012Metric | D1, D2, D8, D9, D10, D75, D76, D77, D78, D79 |
| 9 | 1 kOhm | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R5, R6, R7, R12, R22, R26 |
| 8 | 1 Mohm | Resistor_SMD:R_0402_1005Metric | R17, R18, R19, R20, R36, R37, R38, R39 |
| 8 | 10 kOhms | Resistor_SMD:R_0402_1005Metric | R78, R79, R80, R81, R82, R83, R84, R85 |
| 8 | Y_LED | LED_SMD:LED_0805_2012Metric | D67, D68, D69, D70, D71, D72, D73, D74 |
| 6 | 74HC245 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U7, U11, U14, U16, U26, U28 |
| 6 | 74LS377 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U23, U24, U25, U29, U31, U42 |
| 4 | 74157 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U17, U18, U19, U21 |
| 4 | B_LED | LED_SMD:LED_0805_2012Metric | D63, D64, D65, D66 |
| 4 | D1X8K-14BL | Display_7Segment:D1X8K | U22, U30, U32, U44 |
| 4 | NA555D | Package_SO:SOP-8_3.9x4.9mm_P1.27mm | U1, U4, U5, U35 |
| 4 | R_US | Resistor_SMD:R_0402_1005Metric | R8, R9, R10, R11 |
| 3 | 74HC00 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U3, U6, U20 |
| 3 | AT28C64B-15SU-T | Package_DIP:DIP-28_W15.24mm_Socket | IC1, IC2, IC3 |
| 3 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1, SW4, SW5 |
| 3 | SW_Push_DPDT | Button_Switch_THT:SW_Push_2P2T_Toggle_CK_PVA2xxH4xxxxxxV2 | SW6, SW7, SW8 |
| 2 | 0.1 uF | Capacitor_SMD:C_0402_1005Metric | C3, C10 |
| 2 | 10 Kohm | Resistor_SMD:R_0402_1005Metric | R23, R25 |
| 2 | 74HC86 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U12, U13 |
| 2 | 74LS04 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U40, U41 |
| 2 | 74LS161 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U27, U37 |
| 2 | 74LS283 | Package_DIP:DIP-16_W7.62mm_Socket | U9, U10 |
| 1 | 0.01 uF | Capacitor_SMD:C_0402_1005Metric | C9 |
| 1 | 0.01uF | Capacitor_SMD:C_0402_1005Metric | C8 |
| 1 | 1 MOhm | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 1 MOhm | Potentiometer_SMD:Potentiometer_Bourns_3314G_Vertical | RV1 |
| 1 | 1 uF | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 10 uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 100 kOhm | Resistor_SMD:R_0402_1005Metric | R21 |
| 1 | 22 uF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 74LS00 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U43 |
| 1 | 74LS02 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U8 |
| 1 | 74LS08 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U39 |
| 1 | 74LS107 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U34 |
| 1 | 74LS138 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U38 |
| 1 | 74LS139 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U36 |
| 1 | AMS1117-5.0 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | Conn_01x02_Pin | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J1 |
| 1 | HM62256BLP | Package_DIP:DIP-28_W15.24mm | U15 |
| 1 | SW_DIP_x04 | Button_Switch_SMD:SW_DIP_SPSTx04_Slide_KingTek_DSHP04TJ_W5.25mm_P1.27mm_JPin | SW2 |
| 1 | SW_DIP_x08 | Button_Switch_SMD:SW_DIP_SPSTx08_Slide_KingTek_DSHP08TJ_W5.25mm_P1.27mm_JPin | SW3 |
Questions
How big is the 8-bit computer PCB?
It measures 147.5 × 134 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 8-bit computer use?
261 parts, built around the 74HC245D, 74LS377PC, NA555D and 74HC00D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the 8-bit computer KiCad files?
From the Davoskio/8-bit-computer repository on GitHub, at the commit this page was made from: the board is 8-Bit-Computer/8-Bit-Computer.kicad_pcb and its schematic 8-Bit-Computer/8-Bit-Computer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 8-bit computer design in my own project?
Its repository states no licence, so its author keeps all rights: ask Davoskio before reusing the design.
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